3 Answers
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Unmalted Wheat is traditionally used in Belgian Wit beers. I have not experimented with this myself, but in this podcast about brewing wits, the brewer says that unmalted wheat provides a stronger flavor than malted.

Crushing and boiling separately is a cereal mash. You have to gelatinize the starches in the wheat so that sugar can be broken out during the mash. You can skip the cereal mash if you use flaked wheat or torrified wheat

Unmalted wheat provides a more "tart" wheat flavor to me, as compared to normal wheat malt. It also adds to foam retention and makes a very thick, creamy head on the beer. It will also make the beer quite cloudy if used in large percentages (more than, say, 15%).

Check out Hoegarden Wit, it has a nice luscious head and a creaminess that you can expect from using a lot of flaked wheat.